N is the twenty-seventh volume of the Hidan no Aria novel series released on January 25, 2018. This novel begins the N arc.
- 1st Ammo
- 2nd Ammo
- 3rd Ammo
- 4th Ammo
- 5th Ammo
- Go For The NEXT!!!
- N is Professor Moriarty's organization that Kinji Tohyama has been fighting since Volume 23 and Captain Nemo's emblem, which is on Nemo cap.
- The novel was released along side Cheers! Volume 2, Chūgaku Akamatsu other novel series.
- The novel kicks off the 10th Anniversary year of the Hidan no Aria series.
- The fifth Tohyama sibling, Kanade Tohyama (GV) is introduced.
- All of the Tohyama Siblings (Kinichi Tohyama, Kinji Tohyama, Kinzou Tohyama, Kaname Tohyama, and Kanade Tohyama) appear together.
- Kinji is taking care of Kanade similar to the way he took care of Kaname in Volume 10.
- Sakura Inui from the Hidan no Aria AA makes an appearance.
- Konza Tohyama, the Tohyama Siblings father, is revealed to be alive and in hiding in the U.S.
- Patra returns revealing to be pregnant with her's and Kinichi Tohyama (Kana)'s child.
- Nemo returns.
- Patra (undisguised) has not had an illustration since Volume 4.
- End of volume illustration has Kanade sketched in her regular clothing instead of a Butei's girls uniform.